gnu: geiser: Update to 0.4.

* gnu/packages/emacs.scm (geiser): Update to 0.4.

gnu/packages/emacs.scm

@@ -116,13 +116,13 @@ (define-public emacs
 (define-public geiser
   (package
     (name "geiser")
-    (version "0.3")
+    (version "0.4")
     (source (origin
              (method url-fetch)
-             (uri (string-append "mirror://savannah/geiser/0.3/geiser-"
-                                 version ".tar.gz"))
+             (uri (string-append "mirror://savannah/geiser/" version
+                                 "/geiser-" version ".tar.gz"))
              (sha256
-              (base32 "1yzx0k1y5dq0m9dr3zdrxd8li0pddzblzj1ngd0spvsvvzz6v13j"))))
+              (base32 "0ds7zk9b1839l9fsqfsgrby6manvy1cf5bjniiqhxl55h0cr6ijp"))))
     (build-system gnu-build-system)
     (inputs `(("guile" ,guile-2.0)
               ("emacs" ,emacs)))